Error message

• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Deprecated function: The each() function is deprecated. This message will be suppressed on further calls in book_prev() (line 775 of /home1/montes/public_html/books/modules/book/book.module).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Notice: Trying to access array offset on value of type int in element_children() (line 6592 of /home1/montes/public_html/books/includes/common.inc).
• Deprecated function: implode(): Passing glue string after array is deprecated. Swap the parameters in drupal_get_feeds() (line 394 of /home1/montes/public_html/books/includes/common.inc).